单项选择题

(Be sure to) turn (off) the light (before) you leave. Yes, I'll (turn off it).

A．Be sure to
B．off
C．before
D．turn off it
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单项选择题
He (went) to the library (and spent) the whole afternoon there (to look for) material for an article (on) Shakespeare.
A．went
B．and spent
C．to look for
D．on
单项选择题
His parents are (worried) (because) they haven't heard (of) their son (in) more than two months.
A．worried
B．because
C．of
D．in
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